Calling parent method from child method in Javascript.

Question

I have a class called person:

function Person() {}

Person.prototype.walk = function(){
  alert ('I am walking!');
};
Person.prototype.sayHello = function(){
  alert ('hello');
};

The student class inherits from person:

function Student() {
  Person.call(this);
}

Student.prototype = Object.create(Person.prototype);

// override the sayHello method
Student.prototype.sayHello = function(){
  alert('hi, I am a student');
}

What I want is to be able to call the parent method sayHello from within it's childs sayHello method, like this:

Student.prototype.sayHello = function(){
      SUPER // call super 
      alert('hi, I am a student');
}

So that when I have an instance of student and I call the sayHello method on this instance it should now alert 'hello' and then 'hi, I am a student'.

What is a nice elegant and (modern) way to call super, without using a framework?

Related question

jbabey
– jbabey

2013-04-04 19:42:35 +00:00
Commented Apr 4, 2013 at 19:42 — jbabey
– jbabey, Commented Apr 4, 2013 at 19:42

jmar777 · Accepted Answer · 2013-04-04 19:37:33Z

2

You can do:

Student.prototype.sayHello = function(){
    Person.prototype.sayHello.call(this);
    alert('hi, I am a student');
}

You could also make it a little more generic by doing something like this:

function Student() {
    this._super = Person;
    this._super.call(this);
}

...

Student.prototype.sayHello = function(){
    this._super.prototype.sayHello.call(this);
    alert('hi, I am a student');
}

...although, TBH, I don't think it's worth the abstraction there.

answered Apr 4, 2013 at 19:37

jmar777

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